spiral lamina a double plate
(upper & lower) of thin bone projecting from modiolus into cochlear canal
of bony labyrinth; site of inner attachment for basilar membrane; dendrites
of cochlear nerve run between the two bony plates.

spiral limbus = limbus of spiral
lamina the thickened periosteum of the upper plate of the bony spiral
lamina

spleen L. splen,
or (by dropping "sp") lien = spleen.

splenic corpuscle elongated
mass of lymphoid tissue forming a cuff around a central artery or arteriole
of the spleen.

synostosis G. " + osteon
= bone; junction between two bones made of bone, e.g., bones of skull after
sutures are complete (c. 26 years), junction of a diaphysis with an epiphysis
when growth of a long bone has ceased.

synovia G. " + L. ovum
= egg; like egg-white; fluid in a freely moveable joint (Paracelsus, c. 1520,
first used the term for any watery fluids from any organ).

synovial membrane the lining
of a joint space (other than the articular cartilage) which produces synovia.

thymus G. thymos
= thyme; also soul, vital force; lymphocyte-producing organ in thoracic mediastinum;
sweetbread (origin is obscure: possibly resembling the buds of the thyme herb;
or close to the heart, the seat of the soul).